Strengthening structure mullion of thermal insulation break bridge window

The utility model discloses a strengthening structure mullion of a thermal insulation break bridge window. The strengthening structure mullion comprises a large rectangular frame arranged on the upper portion and a small rectangular frame integrally arranged in the center of the bottom face of the large rectangular frame. The left end and the right end of the bottom face of the large rectangular frame are provided with rubber pads through connecting clamping grooves respectively, a connecting seat below the small rectangular frame is connected with the small rectangular frame through a pair of thermal insulation bars which are arranged in a spaced mode, a baffle parallel to the bottom face of the large rectangular frame and equivalent to the large rectangular frame in length is arranged below the connecting seat, two L-shaped connecting arms are fixed at the bottom of the connecting seat in a left-and-right spaced mode, hooks connected with the two L-shaped connecting arms in a buckling mode are upwards arranged in the middle of the baffle correspondingly in a convex mode, meshed anti-disengagement teeth are arranged between the hooks and the corresponding L-shaped connecting arms, and sealing rubber bars are installed at the left end and the right end of the baffle respectively. The strengthening structure mullion is simple in overall structure and convenient and fast to install and use, the structural strength is greatly improved, and the problem in the prior art is effectively solved.